Concrete-finishing tool



W. GRUNDMANN- CONCRETE FINISHING TOOL.

APPLICATION FILED MAR. 10. 19:9.

[flue/ far [Val/{am fraud/realm W 3- Patented Aug. 3, 1920.

3 SHEETS-SHEET I.

W. GRUNDMANN.

CONCRETE FINISHING TOOL.

APPLICATION FILED MAR I0, 19m.

1 348, 63 9 Patented Aug. 3, 1920.

3 SHEETS-SHEET 2.

am a @7 W. GRUNDMANN.

(IONCRETE FINISHING TUOL.

APPLICATION FILED MAR-10,i919,

1 348,639. Patented Aug. 3, 1920.

3 SHEETS-SHEET 3.

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UNITED STATES WILLIAM GRUNDMANN. OF ST. LOUIS. MISSOURI.

CONCRETE-FINISHING TOOL.

Application filed March 10. 1919.

T 0 all whom it may concern l e it known that I, VVI'LLTAM GR'UNDMANN, a citizen of the United States, residing at Ht. Louis Missouri, have invented a certain new and useful linprovement in Concrete- Finishing Tools, of which the following is a Full, clear, and exact description, such as will enable others skilled in the art to which it appertains to Inalre and use the same, retercnce being had to the accon'ipanying drawings, forming part of this specification.

My invention relates to new and useful improvements in tools for finishing the surfaces of concrete or granitoid structures. such as floors, walks, pavements, gutters, and the like, the principal object of my invention being to provide a tool made up of a number of separate parts which are capable of being assembled so as to form tools which are articularly adaptable for performing di erent finishing operations.

Heretofore it has been the general practice to form or stamp the bodies of the tools from a single piece of material or to make the body from two or more pieces and rigidly secure the same together. As a result of this practice. a different tool. is required for each finishing operation on granitoid. concrete. and the like, and I propose to provide a construction wherein the tool body is made up of a series of separately formed members detachably and adjustably connected to each other and said members capable of being interchangeably used, and thus. with one set of tool members. a number of diflerent tools or tools capable of performing different finishing operations can be readily provided.

Further objects of my invention are, to provide a concrete or granitoid finishing tool which can be easily and cheaply manufactured, readily assembled or taken apart, comparatively light in weight, and very efficient in use.

With the foregoing and other objects in View, my invention consists in certain novel features of construction and arrangement of parts, hereinafter more fully described and claimed, and illustrated in the accompanying drawings, in which- Figure 1 is a perspective view of a tool of my improved construction and of the type utilized for forming a groove in a surface of concrete or granitoid and finishing the sur- Face of the work adjacent to said groove.

Fig. 2 is a perspective view of the handle Specification of Letters Patent.

Patented Aug. 3, 1920.

Serial No. 231,790.

carrying blade or member of my improved tool.

Fig. 3 is a perspe tive view of one of the surfacing members of the tool and which is detachably connected to the handle carrying blade.

Fig. 4 is a cross section taken approximately on the line 4 l ot' Fig. 1.

Fig. 5 is a scwtional view similar to Fig. l and showing a Form of tool utilized for rounding the corners of roinrrste and gran itoid work.

Fig. ii is a vcrti-"al se tion similar to Fig. 5 ani showing inodiliml, censtrlu-tion ol' the corner rounding tool.

Fig. 7 is an elcvational view of a form of tool which has one straight vertical end.

Fig. 8 is a perspective view of one of the finishing members of the tool, the same being provided with a straight vertical end.

Fig. 9 is a cross sectional view similar to Figs. 5 and 6 and showing a form of tool adapted to bevel the corners or angular edges of concrete and granitoid work.

Fig. 10 is a cross sectional view similar to Figs. 5 and 6 and showing .1 further n1odified form of the tool. 7

Fig. 11 is a side clevational view of a form of tool having a pivotally mounted and adjustable handle.

Fig. 12 is a plan view of the form of tool illustrated in Fig. 11.

Referring by numerals to the accompanying drawings and partii-ularlv to the construction illustrated in Figs. 1 to 4: inclusive, 10 designates an elongated flat metal plate. the lower corners of which are rounded or curved gradually upward from the lower edge of the plate to the ends thereof, and the lower edge of said plate and the rounded lower corners and ends are beveled on both sides to form a continuous cutting edge 11. Formed integral with this plate near its ends are upwardly projecting cars 12. the upper portions of which occupy positions at right angles to the plane occupied by the body 10 and secured to the upper portions of these ears in any suitable manner are the ends of a handle 13, of wood or analogous material.

Formed in the body of plate 10 near its ends are vertically disposed slots 14. the same being; adapted to receive the screws or fastening devices which secure the surface finishing parts of the tool to said blade 10. One of these surface finishing members is illustrated in Fig. 3 and said member comprises a horizontally disposed body portion 15 having a smooth llat undersurl'acc and both ends of said body portion being curved upwardly as designated by ll). Formed integral with the outer edge of the body If) and extending from one curved end 16 to the other, is a vertically disposed flange [T which, in addh tion to serving as a straight edge guide or hearing while the tool is in use, acts to prevent soft concrete, granitoid or the like from loading the tool or passing thereonto while said tool is moved backward and forward during the surface finishing operations 7 The opposite or inner edge of the body 15 is provided with a depending flange 1 the outer free of whih is vertically disposed and when the member 15 is assembled with member 10, this face l'cars directly against one of the side fares of said nien'lber 10. The opposite side or underfaee of the depending flange 18 is transversely curved and the upper portion of said curved surface unites with and forms a continuation of the smooth flat undersurface of the member 15.

The end portions of flange 18 are extended u wardly as designated by 19 and the ends of said upwardly turned portions terminate in the same plane with the tops of the upwardly turned end portions 16 of member 15. Formed integral with the end portions of member 15 and adjacent to the inner edge thereof are short vertically disposed flanges 20, the outer faces of which occupy the same vertical plane with that occupied by the outer face of flange 18 and formed through these flanges 20 are apertures 21. When a pair of members 15 are combined with one of the blades 10 to form a tool of the type illustrated in Fig. 1, a pair of said members 15 are horizontally arranged on the sides of the blade 10 and fastening devices such as short bolts 22, are inserted through the apertures 21 and slots 14, the threaded ends of said bolts receiving nuts 23. A fter the members 15 have been adjusted vertically upon the blade 10, the nuts 23 are tightened, thereby securely fastening the parts to each other and the tool is now ready to be used.

As this tool is moved over the surface of concrete or granitoid work, the lower portions of the blade 10 will plow and ride through the upper portion of the concrete or granitoid, thereby forming a. relatively narrow groove therein and the surface of the work immediately to the sides of this groove will be smoothed and finished by virtue of contact with the smooth under surfaces of the members 15 and likewise the under surfaces of the flanges 18 depend from the inner edges of said member 15.

As a tool of this construction is operated, one of the vertical flanges 17 is guided againsta straight edge laid on top of the concrete or granitoid, and a result, the groove in the work is formed in a straight line parallel with the straight edge and as the tool is moved backward and forward to accomplish the smoothing and. finishing operations, the upwardly turned ends 16 on the plates or members 15 will be effective in causing the tool to move freely inasmuch as said curved surfaces will ride over the surface of the work Without tending to enter or plow into said work.

In Fig. 5 l have shown a tool composed of a blade 10 and only enact the plates or members 15, and this form of tool is particularly adapted for rounding and finish ing angular corners of concrete and granitoid; for instance, the outwardly projecting corners of steps. the corners of walls, coping and the like Tn some instances, it may be found desir able to chamfer the edges of the slots 14 in blade 10 and where this is done, short screws may be utilized for securing the member 15 to the blade and the heads of said screws will be countersunk in the chamfered slots, as illustrated in Fig. 6. A tool thus constructed, presents a straight flat surface on the side of the blade 10 opposite the side to which the member 15 is applied.

In the form of tool illustrated in Figs. 7 and 8, one end of the vertical blade or plate 10 is provided with a straight verti rally disposed rear edge 25 and likewise one end of the member 15 which is applied to said blade is made straight and provided with vertically disposed flange 26. This form of tool can be used for forming grooves in the surfaces of work which are arranged at right angles to each other; for instance, in a corner between a horizontal surface and a vertical surface.

In Fig. 9 the horizontally disposed plate or member 15 is shown. as being provided at its inner edge with a depending flange 19". the under surface of which is beveled or inclined as designated by 27 and where this tool is used. the corner of the work will have a straight beveled surface.

In the modified construction. illustrated in Fig. 10, the corner between the body portion 15" and the verticallv disposed flange 17" is rounded as designated by 28, this particular form of tool being for the pur pose of imparting a smooth finish to a portion of rough surfaced granitoid or concrete adiacent to a groove formed therein.

Tn the modified form of tool illustrated in Figs. 11 and 12. one end of a handle 29 is pivotally secured by means of a pin or bolt 30 to the central portion of the central blade or plate 31 of the tooL said bolt being provided with a winged nut 32, which. when tightened, locks the handle 29 in its adjusted position upon said blade or plate 31. Secure to one or both sides of the central blade or plate 31 are horizontally disposed members 33, the undersides of which are provided With smooth finishing faces which engage the Work when the tool is moved thereover.

A tool of my improved construction is comparatively simple, can be easily and cheaply manufactured, and by properly assembling the different parts, tools for performing a number of different operations incident to the finishing of concrete and granitoid work, can be readily provided.

It Will be readily understood that minor changes in the size, form and construction of the various parts of my improved tool can be made and substituted for those herein shown and described Without departing from the spirit of my invention, the scope of which is set forth in the appended claims.

I claim:

1. In a tool of the class described, a vertically disposed blade, a handle secured thereto, a horizontally disposed plate adjustably secured to said blade, the outer edge of said plate being provided with a vertically disposed fiange and the inner edge of said plate being provided with :1 depending blade engaging flange.

2. In a tool of the class described, a vertically disposed blade, a handle secured thereto, a horizontally disposed plate adjustably secured to said blade, one end of said plate being curved upward, a vertically disposed flange projecting upwardly from the outer edge of said plate, and a blade engaging flange depending from the inner edge of said plate.

In testimony whereof I hereunto aflix my signature this 8th day of March, 1919.

WILLIAM GRUNDMANN. 

